Machining tool



W. CHLADEK MACHINING TOOL Nov. l2, 1940.

Filed Nov. 16, 1938 WITNESSES I Q Wxw ing kmotor of 'thlemotor-generator set.

Patented Nov. 12, 1940 PATENT OFFICE MACHINING Toor.

Wilhelm chladek, Berlin-rankow, Germany, as-

signor to Westinghouse Electric &'Manufactur ing Company, -EastPittsburgh, Pa., a corporation cf lenmiylvania Application 'November 16,l1938,"S`erialNo. 240,722 .In Germany December 10, 1937" s claims. (ci.gio-21) My invention relates to machines for vproducing relative motionbetween machining tools and objects to" be machined, for example,milling machines and'boring machines.

There is a tendency to use for the feeding motion of modern machiningtools v'adjustable speed direct current motors Vto whichV power issuppliedfrom a source of variable voltage as a Ward-Leonard type ofcontrol for a generator of a motor generator set. If, however, thisdriving motor and the motor-generator set would have to be dimensionedfor producing the high feeding speeds required when the Work is beingmounted'on a bed or platen, the cost involved r would be prohibitive.

` My invention proposed, therefore, to produce the normal feedingmotions required in the course of the machining process proper by meansof the motor which is energized from the 'variable voltage control,`andto produce the rapid feeding motions required when the work is being setup by means of the more powerful driv- This motor of the motor-generatorset is more powerful than the motor which isl energized by thecontrolled generator, because it must overcome losses in the wholesystem.

Usually the driving motor of the motor-generator set will havesufficient power when a take off isV employed in accorda-nce with myinvention.` Even if it is necessary 'to' increase the power of suchdriving motorin order to take care of the increased power necessary foreffecting rapid movement of the bed or platen or other similar movablepart of the machine, my invention will still have outstandingadvantages, inasmuch `as the driving motor of the motorgenerator setwould be the only machine of the set which would require 'a high rating.The remaining machines of the set, namely, the generator driven by saidmotor and the motor which is excited by said generator and the excitingmotor of said generator willnot require higher ratings. A broad objectof my invention is to selectively secure, as desired, either a smalleror larger power froma motor-generator system for slow or rapid movement,respectively, of the object to be machined or of the machining tool.

A more specific object of my invention is to selectively secure, asdesired, either a vsmaller or larger power from a motor generator setfor slow or rapid movement, respectively, ofa platen in a, millingmachine. f

Another specific object of my invention is 'to selectively secure asmaller or larger power from a `motor generator system for slow or rapidmovement, respectively, of the movable support for a boring spindle in aboring machine.

Other objects and advantages will become more apparent from a study ofthe following specification when considered` in conjunction with theaccompanying drawing, in which:

` Figure lis a side view of a milling machine embodying my invention,

Fig. 2 is a top view partly in section of the milling machine shown inFig. 1, and

Fig. 3 is a side view of a boring machine showing another embodiment ofmy invention.

VIn Figs. 1 and 2 numeral I denotes a motorgenerator set comprising amotor 2 and Vgenerator 3 having attached thereto an exciter 4 forl thegenerator. An adjustable speed direct current motor 5 is part of thesystem and is energized by the generator 3 of the motor-generator setI'. This motor 5" drives a gear E. A system vof gears comprising gears1, 8 and 9 is driven by the motor 2 of the motor-generator set I. Aplaten I0 has a rack I I secured thereto which rack is longitudinallymovable through a gear I'2` rigidly mounted on the shaft I3 which shaftis surrounded by and splined to sleeve shaft I4 to permit relativelongitudinal movement, only, therebetween. Rigidly mounted on sleeveshaft I4 is a gear I5. Sleeve shaft Ill is slidable by a bifurcatedelement I6 which isv manually movable by handle Il pivoted on element I8so that gear I5 may be slid into engagement either with gear 6 or withgear 9 for effecting the driving of theA platen I0 through gear I2either by the motor 5 or'by the motor 2 of the motor-generator' set Iand its accompanying gear system 1, 8 and 9 respectively.

The reference numeral I9 denotes a machining tool which in itself formsno part of my invention. Motor 2 is energized by an incoming threephaseline 20, 2I, 22. Generator 3 is energized by exciter' through conductors23 and 24. The motor 5 is energized by generator 3 through conductors 25and 26'.

The operation of my device is as follows. Normally, when slow feeding ofplaten I3 is desired, such platen is driven by motor 5 through gears 6,I5 and I2. When it is desired to move plate I0 at a high speed such asin the case where work is being mounted on the bed or platen I8, gearI5, together with sleeve shaft I4, isslid along shaft I3 by the manuallyoperated handle I'l, into engagement with gear 9.

` Fig. 3 shows a boring machinehaving a frame upon which is mounted amotor 3| which drives a sleeve 312. Sleeve 32 drives a shaft 33 which issplined thereto. By virtue of the splined arrangement, relativelongitudinal movement is permitted between shaft 33 and motor 3I`.Support member 34 is mounted so as; to be capable of sliding movement onframe 30 through grooves 35. Rigidly attached to shaft 33 are collars 36and 31 which restrain the slidable support 34 and shaft 33 from relativelongitudinal movement. v Shaft 33 carries a boring tool 38 whichI isrigidly secured at `the bottom thereof. Rigidly secured to frame is arack 39. A gear 40 which is manually rotatable by handle 4|, and whichis pivoted on shaft 42 at right angles thereto, is engageable with therack. Therefore, when gear 40 engages rackv 39, it will be seen that byturning handle 4|, slidable support member 34 can beA moved up -or down.Rigidly secured to the slidable member 34 is a member 43 having thereona `rack 44 lwhich is engageable with a gear 45,' which gear is rigidlysecured to shaft 42.

A motor-generator set 46 comprising a'motor 55, generator 5B and anexciter 5'| for said generator drives asprocket 4'|fand through chain-48drives another sprocket 49.' Shaft 50 is splined to sprocket` 49 andis,therefore, rotatable with it. Sleeve shaft 42 surrounds and issplined to shaft 5i), therefore, it` can move/onlyk llongitudinally withrespectthereto. A,V member 5| rigidly secured to frame 30 restrainssprocket 49 from movement to the left. Pivoted on frame'3` at po-int 52.is'a manually operated lever 53 which has a bifurcated arm 54 which armsurrounds shaft42 and by means of collars .58 which are rigidly securedtosleeve shaft 42, shaft 42 can be moved to the yright or to the left.When f moved to` the right-gear 49 will be brought into engagement rack39 and atthe same time gear will be'dis'engaged from rack 44. Whenmoved, to the left, gear 45 will be brought into engagement with lrack44and at the same time l gear 49 will be disengaged from rack 39.Members 5| and 66 act as stop members for collars 58. The generator ofythe motor generator set 46 energizes the driving motor 3| through"conductors59 and 6i). Exciter 51 energizes the field of generator 53through conductors-6| and 62. Motor 55 is energized from a three phasepower line 63, 64 and 65. The operationof the device .in Fig.r3 is'asfollows: The driving motor. 3| rotates the boring tool l33. Normally,the boring toolis fed through the gear 49 and rack 39, by manuallyoperating handle 4|. For such operation, lever 53 must be movedcounter-clockwise,` vwhich movement will effect disengagement of gear 45and rack 44 and at the same time effect 'engagement of gear- 40 and`rack 39. Whenr it is desired toV raise movablesupport 34 rapidly, as inthe situation where a new 'work pieceis being inserted, lever 53 isturned clockwise, thus shifting sleeve shaft 42 to the left and causingengagement between gear 45 and rack 44 and at the same time,disengagement of gear 43 and rack 39, thus the motor-generator set 46vthrough its drive will rotate splined shaft 59 and, throughr gear 45and rack 44, will move c slidable support 34 upwardly.

I am,y of course, aware that others, particularly after having had thebenefit of the teachings of my invention, may devise other mechanismsembodying my invention, and I, therefore, do not wish'to be limited tothe specific showings made in the drawings, and the descriptivedisclosure hereinbefore made, but wish to be limitedonly bythe scope ofthe appended claims and such priorart that may be pertinent.

I claim'as my invention: v `1. In combination, amachine,` a motor, agear system driven by said motor .a4 motor generator set which energizessaid motor, a second gear system which is driven by said motor generatorset, and controllable means for completing a driving connection to saidmachine either through said iirst gear system or said second gearsystem.

2. In a milling machine, in combination, a motor, a gear system drivenby said motor, a motorgenerator setwhich energizes said motor, a secondgear `system which is driven by said motor generator set, a platen,controllable means for v completing a driving connection to said plateneither through said first gear system or through said second gearsystem.

3. In a milling machine, in combination, a motor, a. gear system drivenby said motor, a motorgenerator set which energizes said motor, asecondge'ar system which is drivenby said motorgenerator set, a platen,means in driving engagement with said platen including a slidable gear,and a second means for sliding said gear into engagement' with eithersaid first gear system or into engagement with said second gear systemfor selectively securing drive of said platen by either vsaid motor orVsaid motor-generator set, respectively. f

4'.' Ina milling machine, in combination, a motor, a gear system drivenby saidmotor, a motorgenerator set which energizes saidmotor, asecl ondgear system which. is drivenby said motorgenerator set, a platen,meansin driving engagement with said platen rincluding agear which isrigidly mounted on Va shaft,4 a 'sleeve which surrounds and'is splinedto a portion .of said shaft, a. second gear 'which is rigidly secured tosaid'sleeve, means for moving said second gear into driving engagement'with either saidrst gear system or said second gear system forselectively "securing drive of said platen by either said motor or saidmotor generator set, respectively.

5. In a milling machine, in combination, a motor, a gear system drivenbyv said moto-r, a motor-generator setwhich energizes said motor, asecond gear system whichV is driven by said motr-generatorset, a platen,means in driving engagementwith said platen including a gear whichlisrigidly mounted on 'a` shaft,` Va sleeve which surrounds and is splinedto a portion of said shaft, a second gearIwhich is rigidlylsecured tosaid sleeve, manually operated means for moving said second gear intoVdriving engagement with eithersaid first gear system or saidsecond gearsystem for selectively-securing driveof'said platen byeither Vsaid motoror' said motor generator set, respectively.

A machine tool comprising, in combination, a machine tool element,` aplaten which carries a workpiece, means for effecting relative motionbetween said machine toolelement and workpiecelcomprising amotor, agearsystem .driven CHLADEK.

